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Finding the Fourth Proportional to 631.84, 945.68 and 387.16

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Solution

The fourth proportional to 631.84, 945.68 and 387.16 is: 579.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.84 : 945.68 = 387.16 : x
  2. Step 2: Convert to fraction form
    631.84/945.68 = 387.16/x
  3. Step 3: Cross multiply
    631.84x = 945.68 × 387.16
  4. Step 4: Simplify right side
    631.84x = 366,129.47
  5. Step 5: Solve for x
    x = 366,129.47/631.84
  6. Step 6: Final answer
    x = 579.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.